## The First Six and the Eleventh and Twelfth Books of Euclid's Elements: With Notes and Illus., and an Appendix in Five Books |

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Side 89

IN a given circle to inscribe a triangle

a given circle, and DEF a given triangle; it is required to inscribe in ABC a triangle

IN a given circle to inscribe a triangle

**equiangular**to a given triangle. Let ABC bea given circle, and DEF a given triangle; it is required to inscribe in ABC a triangle

**equiangular**to DEF. Draw the straight line GAH (III. 17.) touching the circle in ... Side 93

be inscribed in the rectilineal figure ABCDE: wherefore any equilateral and

and (const.) FG is perpendicular to BC, and FH to CD. Hence the centre of the

inscribed ...

be inscribed in the rectilineal figure ABCDE: wherefore any equilateral and

**equiangular**rectilineal figure, &c. Cor. BC is bisected (III.3.) in G, and CD in H ;and (const.) FG is perpendicular to BC, and FH to CD. Hence the centre of the

inscribed ...

Side 97

It is also

arc FG ; and (III. 27.) the angles which stand on equal arcs are equal to one

another, whether they be at the centre or circumference. In the given circle,

therefore, ...

It is also

**equiangular**: for each of its angles stands on an arc which is treble of thearc FG ; and (III. 27.) the angles which stand on equal arcs are equal to one

another, whether they be at the centre or circumference. In the given circle,

therefore, ...

Side 142

In like manner, by varying the positions of the triangles, it would be shown that

the sides about B and D, and those about C and E are proportional. Schol. Hence

(VI. def. 1.)

...

In like manner, by varying the positions of the triangles, it would be shown that

the sides about B and D, and those about C and E are proportional. Schol. Hence

(VI. def. 1.)

**equiangular**triangles are similar. Cor. If two angles of one triangle be...

Side 297

the angles BCM, ACM, or ACF, ACM are supplements of each other; as are also

the arcs BM, AM, or AF, AM, since (III. 26.) BM, AF are equal. Now the triangles

CGF, COM are

the angles BCM, ACM, or ACF, ACM are supplements of each other; as are also

the arcs BM, AM, or AF, AM, since (III. 26.) BM, AF are equal. Now the triangles

CGF, COM are

**equiangular**and have the sides CF, CM equal; therefore (I. 26.) ...### Hva folk mener - Skriv en omtale

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The First Six and the Eleventh and Twelfth Books of Euclid's Elements: With ... Euclid Ingen forhåndsvisning tilgjengelig - 2016 |

### Vanlige uttrykk og setninger

ABCD altitude angle ABC angle BAC angle equal BC is equal bisected centre chord circle ABC circumference cone const contained cylinder describe a circle diagonal diameter divided draw equal angles equal to AC equiangular equilateral Euclid exterior angle fore fourth given circle given point given ratio given straight line greater half Hence hypotenuse inscribed join less Let ABC magnitudes manner multiple opposite parallel parallelepiped parallelogram perpendicular polygon polyhedron prism PROB produced PROP proportional proposition pyramid radius rectangle rectilineal figure right angles Schol segments semicircle sides similar similar triangles solid angles square of AC straight lines drawn tangent THEOR third triangle ABC triplicate ratio vertex vertical angle wherefore

### Populære avsnitt

Side 94 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.

Side 53 - If a straight line be divided into any two parts, the squares of the whole line and of one of the parts are equal to twice the rectangle contained by the whole and that part, together with the square of the other part. Let the straight line AB be divided into any two parts at the point C : the squares of AB, BC shall be equal to twice the rectangle AB, BC, together with the square of AC.

Side 143 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.

Side 4 - A rhombus is that which has all its sides equal, but its angles are not right angles.

Side 57 - To divide a given straight line into two parts, so that the rectangle contained by the whole and one of the parts may be equal to the square on the other part.

Side 138 - IF a straight line be drawn parallel to one of the sides of a triangle, it shall cut the other sides, or those produced, proportionally; and if the sides, or the sides produced, be cut proportionally, the straight line which joins the points of section shall be parallel to the remaining side of the triangle...

Side 43 - In any right-angled triangle, the square which is described upon the side subtending the right angle, is equal to the squares described upon the sides which contain the right angle.

Side 32 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.

Side 40 - To a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.

Side 36 - PARALLELOGRAMS upon the same base, and between the same parallels, are equal to one another...